Lymecycline is a fairly recent broad spectrum tetracycline antibiotic.
As such it has a distinctive four-ring structure
with a side chain, which enhances its solubility and makes it easily absorbed.
In fact the sidechain consists of the amino acid lysine, linked by a -CH2- methylene group
to the amino group at the end of tetracycline.
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It is used to treat a variety of bacterial infections, including acne.
Click below to highlight sections of the molecule,
or hold down left mouse button and drag over it to move it in 3-D.